RAYMOND: CORRELATION OF THE ORDOVICIAN STRATA. 241 
position of the Ottosee in relation to the other formations is that given 
by Bassler (98) from outcrops on Walker Mountain north of Marion, 
Smyth Co., Virginia. The strata there named “Holston marble and 
associated strata’’ were later named Ottosee by Ulrich. 
Feet. 
Sevier shale. 
Brown to olive and gray shales. 1500 
Moccasin limestone. 
Impure, argillaceous limestone. 300 
Ottosee formation. 
(e) Unfossiliferous drab shales. 40 
(d) Nodular limestone and yellowish to gray Bak | 
holding many Bryozoa. 30 
(c) Massive gray and pink marble with numerous 
Bryozoa, Solenopora and Stylaraea parva. 30 
(b) Clayey nodular limestone and shale. Some of the 
layers are crowded with Receptaculites. 50 
(a) Massive crystalline limestone. 40 
Athens shale. 
Dark to black shale with black slaty limestone at the 
base. Linguloids and trilobites are abundant at the 
base. / 500+ 
Stones River formation. 170 
Knox dolomite (Beekmantown in age). 
The Stones River of this section is stated by Bassler to contain in its 
upper part a typical Chazy fauna, though the only species mentioned 
are Maclurites magnus and Stylaraea parva. 
‘ The trilobites mentioned as occurring in the Athens are not listed, 
but it is known that this formation in at least two places in Virginia 
carries the Nemagraptus gracilis (Normanskill) fauna. (See p. 234). 
From the Ottosee Bassler lists Echinosphaerites, Batostoma seviert, 
Scenellopora radiata, Diabolocrinus .vesperalis, Solenopora compacta, 
and Receptaculites biconstrictus. It is quite true that this fauna is 
somewhat unlike that of the Echinosphaerites zone in the other 
localities, but there is nothing in the composition of the fauna 
itself to indicate that it is older than Black River. Receptaculites 
biconstrictus is similar to the Black River R. occidentalis, which occurs 
with Echinosphaerites at Chambersburg and Bellefonte, Pa., Batos- 
toma is principally a Black River genus, and the other fossils of the 
Ottosee have a rather indefinite value in correlation. 
